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                    <h1>Android-框架：AndroidAnnotations学习及出现问题</h1>
                    
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                         作者 Leeves
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                          日期 2016-09-28
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            Android-框架：AndroidAnnotations学习及出现问题
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                <p>这个AndroidAnnotations很多人说好用，不过个人认为上手比较难，尤其是在一些注释上，本次介绍AndroidAnnotations在AndroidStudio配置，以及简单使用。</p>
<h2 id="1-gradle配置"><a href="#1-gradle配置" class="headerlink" title="1.gradle配置"></a>1.gradle配置</h2><p>在全局的build.gradle上添加：</p>
<pre><code>buildscript {
    repositories {
        mavenCentral()
    }

    dependencies {
        // 当前自己使用的gradle版本
        classpath &apos;com.android.tools.build:gradle:2.1.3&apos;
        // 当前android-apt plugin的版本
        classpath &apos;com.neenbedankt.gradle.plugins:android-apt:1.8&apos;
    }
}

repositories {
    mavenCentral()
    mavenLocal()
}
</code></pre><p><br><br>　在局部gradle，也就是Module:app的gradle，添加：</p>
<pre><code>apply plugin: &apos;com.android.application&apos;
apply plugin: &apos;android-apt&apos;
def AAVersion = &apos;4.1.0&apos;     //本次使用的AndroidAnnotations为4.1.0

dependencies {
    apt &quot;org.androidannotations:androidannotations:$AAVersion&quot;
compile &quot;org.androidannotations:androidannotations-api:$AAVersion&quot;
}

apt {
    arguments {
        //查找解析androidManifestFile文件
        // 在gradle版本2.21以前写这个：androidManifestFile variant.processResources.manifestFile
        androidManifestFile variant.outputs[0]?.processResources?.manifestFile
        //你自己的包名
        resourcePackageName &apos;com.leeves.myandroidannotations&apos;
    }
}
</code></pre><p>　这样子就配置好了，点<code>Sync Now</code>,同步gradle即可。</p>
<h2 id="2-使用方法"><a href="#2-使用方法" class="headerlink" title="2.使用方法"></a>2.使用方法</h2><p>直接上demo吧，在demo里面容易看懂：</p>
<pre><code>//省去写onCreate方法中的 setContentView
@EActivity(R.layout.activity_annotations)
public class AndroidAnnotationsDemo extends Activity {

    //如果变量名字和EditText控件名字相同，不用写R.id.mEditText
    @ViewById
    EditText mEditText;

    //这里不同，所以要写
    @ViewById(R.id.iv)
    ImageView mImageView;

    //button直接写点击事件
    @Click(R.id.bn1)
    void setPictureUrl() {
        getPictureUrl(mEditText.getText().toString());
    }

    //后台线程处理网络请求
    @Background
    void getPictureUrl(String pUrl) {
        try {
            URL url = new URL(pUrl);
            InputStream is = url.openStream();
            Bitmap bitmap = BitmapFactory.decodeStream(is);
            is.close();
            showPicture(bitmap);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //后台处理完后，在UI线程上显示
    @UiThread
    void showPicture(Bitmap bitmap){
        mImageView.setImageBitmap(bitmap);
    }
}
</code></pre><p><br><br>　　简单的使用呢，就是<code>@EActivity</code>绑定layout、<code>@ViewById</code>绑定控件、<code>@Click</code>绑定点击事件、<code>@Background</code>后台处理、<code>@UiThread</code>UI主线程处理，本来想写个ListView的demo，下次吧，下次再学习深入一些AndroidAnnotations，还是很强大啊，就是上手难。如果单单是为了不用写findViewById的话，那就用Butterknife或者LayoutCreator就行了。
　　</p>
<ul>
<li>出现问题及注意事项</li>
</ul>
<p>　　1.如果AS出现这个错误：<code>Only the original thread that created a view hierarchy can touch its views</code>。<br>　　答：这个其实是你<code>@UiThread</code>导入错误，不是导入：<code>android.support.annotation.UiThread</code>，是导入这个：<code>import org.androidannotations.annotations.UiThread</code>。<br>　　2.上面忘了说，在<code>AndroidManifest.xml</code>声明这个Activity的时候，要加下划线：<code>&lt;activity android:name=&quot;.AndroidAnnotationsDemo_&quot;/&gt;</code>，这时候AS会显示红色，编译一下就没事了。<br>　　3.AS出现这个错误：<code>Unable to find explicit activity class{...}have you declared this activity in your AndroidManifest.xml?</code><br>　　答：跳转到该activity时，也要加下划线：<code>startActivity(new Intent(MainActivity.this,AndroidAnnotationsDemo_.class))</code></p>

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